1	#!/bin/bash
2
3	### Lazy Evaluation of Alternative
4	i=0
5	x=x
6	echo ${x:-$((i++))}
7	echo $i
8	echo ${undefined:-$((i++))}
9	echo $i # i is one because the alternative was only evaluated once
10	# status: 0
11	# stdout-json: "x\n0\n0\n1\n"
12	# N-I dash status: 2
13	# N-I dash stdout-json: "x\n0\n"